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"In a sense we have come to our nation's capital to cash a check. When the architects of our republic wrote the magnificent words of the Constitution and the Declaration of Independence, they were signing a promissory note to which every American was to fall heir. This note was a promise that all men, yes, black men as well as white men, would be guaranteed the unalienable rights of life, liberty, and the pursuit of happiness."

This obvious reference to Thomas Jefferson's sentiments in The Declaration of Independence can be found in

A)
The Autobiography of Malcolm X from 1965.

B)
Martin Luther King Jr's I Have a Dream speech from 1963.

C)
Booker T. Washington's The Atlanta Compromise speech from 1895.

D)
Marcus Garvey's The Declaration of Rights of the Negro Peoples of the

As King says, it was clear in 1963 that the United States had not come through on this guarantee. Isolation and racial segregation made it with the goal that African Americans were absolutely not ensured these rights and were positively not being treated as though they were made equivalent.

By coming to Washington in 1963, African Americans were requesting that the US satisfy its guarantee. They were stating that it was the ideal opportunity for the US to stay faithful to its commitment and give them the equivalent rights that it had said all Americans ought to have in the Declaration of Independence and the Constitution. This is the thing that King implies when he says that the marchers have come to Washington to money a check.